期刊
NANOMATERIALS
卷 12, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/nano12091529
关键词
gold nanoparticles; proteins; patchy colloids; self-assembly; nanosensor; hybrid nanomaterials; biosensing; Small Angle X-ray Scattering (SAXS); plasmonic resonance
类别
资金
- EU Framework Programme for Research and Innovation Horizon 2020 [730872]
- Sapienza University of Rome [AR11715C821B8F01]
This study presents a thorough investigation of a hybrid nanomaterial based on the protein-mediated aggregation of gold nanoparticles. The main factors that determine the assembly process and their strong correlation with the optical properties of the assemblies were established. The calibration curves obtained based on the extinction spectra indicate the notable flexibility of this nanomaterial, enabling the selection of different working ranges with high sensitivity.
Multi-responsive nanomaterials based on the self-limited assembly of plasmonic nanoparticles are of great interest due to their widespread employment in sensing applications. We present a thorough investigation of a hybrid nanomaterial based on the protein-mediated aggregation of gold nanoparticles at varying protein concentration, pH and temperature. By combining Small Angle X-ray Scattering with extinction spectroscopy, we are able to frame the morphological features of the formed fractal aggregates in a theoretical model based on patchy interactions. Based on this, we established the main factors that determine the assembly process and their strong correlation with the optical properties of the assemblies. Moreover, the calibration curves that we obtained for each parameter investigated based on the extinction spectra point out to the notable flexibility of this nanomaterial, enabling the selection of different working ranges with high sensitivity. Our study opens for the rational tuning of the morphology and the optical properties of plasmonic assemblies to design colorimetric sensors with improved performances.
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